Investingating the Nature of Young Stars with 2-4 micron Spextroscopy

Details Investingating the Nature of Young Stars with 2-4 micron Spextroscopy Investingating the Nature of Young Stars with 2-4 micron Spextroscopy

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20517409b&link_type=abstract

American Astronomical Society Meeting 205, #174.09; Bulletin of the American Astronomical Society, Vol. 37, p.378

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results on our 2-4 micron spectral study of ˜25 stars observed through and embedded within the Ophiuchus dark cloud complex. Our sample is comprised of a mix of deeply embedded protostars, Classical T Tauri stars and Weak-Lined T Tauri stars that are reported in the literature to have large visual extinctions (Av > 10 mag). We discuss the observed variations in the depth and profile of the 3 micron absorption feature which arises from water ice frozen onto grains in the interstellar and circumstellar environment and the line strengths of atomic hydrogen emission features that trace the magnetospheric accretion of material onto a young star. By modeling the profile of the water-ice absorption, we have searched for thermal processing of ices that could arise as circumstellar material is heated by accretion onto a young star. We also show the 1 - 4 micron spectra of a curious Weak-Lined T Tauri star that exhibits strong water vapor absorption beyond anything expected from its spectral type or evolutionary state.
This study has been supported in part by the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Particle Physics and Astronomy Research Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), CNPq (Brazil), and CONICET (Argentina).

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